Hi
Thank i solve my problem in fact it was easy.
i confimr that classpathPluginLoader does not exist, if i want one i have to develop it.
I take another approach simple when my plugin is compiled i automatically put it in a folder, and run the main system with only my plugin and its dependencies.
So i can debug it and its work.
So i use this solution for now.
Excuse my english not very good.
In short terms i copy my plugin and its dependencies in a forlder run the core-system in debug mode and its ok. I can debug its works very well.
thanks we can close this discution.
Pf4j is amazing ligth simple and fit perfectly my needs.